Analysis on the Development of Glass Industry Refractory in China

Over the past decade, China's glass industry with refractory materials have made great progress, integrated in the large-scale float glass kiln kiln, from 3 to 4 years to 5 to 8 years, and all the materials to achieve the localization, greatly Narrowing the gap with the advanced level of foreign countries, for the glass industry with the future development of refractories, laid a solid foundation. But with the further development of the glass industry needs and foreign advanced level, there are still many problems to be solved.

After China accession to the WTO, foreign high-quality low-cost products can drive straight into the same time, China's quality products into the international market has become more convenient. Seize the opportunity to seriously analyze China's glass industry refractory problems and the gap with the world's advanced level, to take the right countermeasures, as soon as possible to narrow the gap with the developed countries, catch up with the world's advanced level, which will be our response to WTO challenges Best response. The following will be based on the current main problems, combined with the future development of thinking, put forward some suggestions.



First, bigger and stronger With strong technical innovation strength and international competitiveness of the Ministry of Industry and Trade integration of large supporting refractory leading enterprises, so as to enhance the overall level of the industry, driven by the development of the industry as the dominant force.

At present, the glass industry refractory industry there are many enterprises, small scale, decentralized, low-level redundant construction, their own war, the market disorderly competition and so on, resulting in the overall level of the industry to improve slowly. In recent years, China has built more than 30 refractory refractory enterprises, these enterprises in recent years despite the majority of different degrees of progress, but most of the smaller production scale, weak technical force, backward technology and equipment , Product quality is difficult to guarantee. Sintered refractories have a similar situation. Thus forming a common product over the one hand, on the other hand high-end products still need to import the situation, and because of these enterprises cheap dumping, resulting in market chaos, a backbone enterprises to improve product quality barriers. Therefore, the urgent need for strength of the industry and trade integration of the refractory company, to ensure the quality of reliable quality supporting refractory materials. This kind of company can use its own strong integration of resources, bigger and stronger, and guide the industry to continuously improve the overall level, climbing new peaks. The so-called bigger is the company to have their own control of a certain size of the cast refractories, alkaline refractories, silica bricks, zirconium, zirconia corundum, sillimanite, mullite refractories and new unshaped refractory production base And supporting system, can provide the whole kiln quality supporting refractory materials to meet the glass industry, including the glass fiber industry, the demand for refractories. The so-called strong, is to rely on the new strong, make full use of strong technical advantages, continuous technological innovation, enhance the overall level of the industry, making it an international competitiveness of large refractory supporting companies.

Second, the design of glass melting furnace, the production of refractory materials, the operation of the furnace, maintenance, use and refractory production and use of scientific research between the four closely, is to extend the kiln kiln, as soon as possible to reach the international advanced level One of the important conditions.



To extend the kiln kiln must have two conditions: First, the integration of industry and trade supporting the refractory company, to provide all kinds of high-quality refractory refractory materials; the second is to design, production, use and research Close combination, to play their respective advantages, so that the whole kiln refractory configuration more reasonable, especially the kiln age of more than 8 years of high-grade melting pot, has not entirely rely on to improve the quality of refractories can be achieved. Superb design, careful operation, maintenance and management of quality and supporting the supply of refractory materials must be closely integrated in the past that the tube of a section, do not communicate with each other, out of touch with each other, the lack of the overall concept of the situation is the long melting of the kiln kiln One of the important reasons.

The current problem is how to implement? Who will be implemented, first of all by the combination of the four parties? According to past experience, with strong technical strength of the industry and trade integration of refractory materials supporting the company most suitable, on the one hand, Refractory material performance and data to master, you can recommend to the design and use of various ancillary programs to choose from; on the other hand to the use of the Department to provide the required variety of quality supporting refractory materials, and tracking the use of, constantly To provide users with services to help solve the problems that may arise in the use of the Quartet string together, often communicate, complement each other to form a whole, together to improve the kiln kiln and the relevant technical and economic indicators and efforts. Of course, industry associations should also give full play to the industry self-discipline and industry coordination functions, the industry elite to achieve this goal together.

News about the development of Glass Refractory Industy in China

The development of refractories has three main drivers: to maintain and improve the quality of the glass; the economic requirements of the glass furnace to make the kiln longer operating cycle and the use of pure oxygen combustion system after the impact and impact.

The current changes in the electronics industry and the computer industry can be interpreted as months or weeks, and when it comes to the development and application of refractory materials in the glass industry, it can easily be interpreted as five or ten years. According to this concept of time, we will review and discuss changes that have taken place in the "future" (more conservative pace) in the "current".



There are three main drivers for the change and development of refractory materials. The first is the need for glass manufacturers to maintain at least to maintain the quality of the glass. The second is the economic requirements of the glass furnace to make the kiln run longer, and the third is the pure oxygen combustion system to bring the impact and impact. These three requirements usually determine the use of improved refractory materials in the kiln. These drivers also enable glass manufacturers to use improved refractory products during kiln maintenance and use and new technologies for extensive maintenance during the run cycle.

The molten cast alumina brick has been used in this part of the melting tank to build its application, mainly in the melting of high quality glass pure oxygen burning furnace furnace has been applied. Prior to the advent of pure oxygen combustion technology, only beta-alumina bricks were used to melt the superstructure of the pond, and no molten cast alumina bricks were used on top of the melting tank. Now, fermented cast products, whether beta-alumina or alpha-beta alumina, are used in the production of color television (screens and cones), float glass, and borosilicate glass in part or all of the furnace on. The molten cast AZS brick can generally be used at 1600 ° C or 1650 ° C (depending on the glass product), while the furnace with a fused alumina brick can be successfully operated at 1700 ° C. This creates better conditions and greater flexibility for glass manufacturers in the production of refractory glass.

For many years, molten cast AZS furnaces have been successfully tested for cooling and reheating so that they can use multiple operating cycles. Now a little experience has been gained in the successful implementation of the fused alumina furnace top cooling and reheating, when they use two or more operating cycles to show more economically viable vitality. The results of the fused alumina furnace tops observed during use (thermal observation and shutdown observation) show that these materials are both chemically stable and mechanically stable. This was the earliest observation of this masonry, since there was no reference material for fused alumina at the time and no empirical basis for its application at the top of the furnace.



High chromium refractory products used in the past mainly used to enhance the glass melting furnace, and a small amount used in the insulation glass pool furnace. Now high-chrome bricks are being used more and more by some soda-lime glass pits. Its main use is not limited to all or part of the flow hole, but also for the end wall and to a limited extent for the feed mouth of the angle brick. For the components of high chrome tiles, they are potentially tedious, so that high chromium products are usually not compatible with very "white" glass. The initial period of this product is mainly used for colored glass, but now high-chromium products have also been successfully used in a transparent container glass furnace. The amount of high chromium products used in glass furnaces depends to a large extent on the design of their flow holes, the cooling of the liquid bath, the daily production of the furnace, and the operation of the furnace. A glass manufacturer may use high chrome tiles for all cover plates plus the end wall of the melting tank. The flow of high-chrome brick masonry provides the potential to increase the life of the kiln because the corrosion resistance of most of the material to the glass is at least twice that of the molten AZS. However, some of the design and operating parameters are different from the molten AZS brick, it is necessary to discuss with the supplier.

Glass Refractory Industy news and the best glass refractory supplier from China

Modern glass production technology compared with the traditional process has been a qualitative leap, towards a higher efficiency, lower energy consumption, better product quality in the direction of continuous development. Kiln as the core of glass production equipment, its technical level is also progressing, widely used to improve the combustion strength, strengthen the heat transfer effect, reduce heat loss, reduce the product and environmental pollution and other new technologies. 

China's glass industry has developed rapidly, has long been the world's first glass production power. The rapid development of the glass industry, naturally promote the development of China's glass kiln refractory materials and technological progress. Modern glass production technology compared with the traditional process has been a qualitative leap, towards a higher efficiency, lower energy consumption, better product quality in the direction of continuous development. Kiln as the core of glass production equipment, its technical level is also progressing, widely used to improve the combustion strength, strengthen the heat transfer effect, reduce heat loss, reduce the product and environmental pollution and other new technologies. The technological progress of the kiln requires a variety of quality refractory materials as a guarantee condition, requiring refractories to withstand higher temperatures, more abrupt temperature changes, more intense chemical erosion, more severe stress damage, and only supporting the use of multiple varieties High-quality refractory materials, kiln new technology, energy efficient, low pollution and other advantages can be achieved. High-quality refractory materials for modern high-temperature technology is not only consumable materials, but also to achieve high-temperature new technology necessary functional materials. 



Foreign refractory materials for glass kilns 

1.AZS and high zirconia brick
On the melting of AZS brick is to improve its anti-erosion and wear resistance of the production process, in addition to the oxidation method of melting, so that the product carbon content down to 0.005%, glass phase precipitation temperature increased to 1450 ℃ outside. The casting and annealing processes have also been improved to produce fused AZS with little or no shrinkage. ZrO2 content of more than 90% of the high zirconia brick, the thermal shock performance is very good, such as ZrO2> 95%, SiO2 <1.4%. Stabilizer <3.7% of high zirconia brick, the bulk density of 4.7g / cm3, porosity <18.4%, thermal shock resistance from room temperature to 1400 ℃ (15 minutes interval) up to 15 to 20 times. Japan produces a cast zirconia brick with a zirconia content of> 90%, called ZFC brick, and its corrosion resistance is better than ZrO2 content of 40% of the AZS brick, at 1500 ~ 1600 ℃, 16 hours after the glass phase Precipitation, little pollution on the glass, after 800 ~ 1250 ℃ thermal shock resistance test 40 times without cracks. 

2. Chrome brick and chrome brick
To the static pressure molding of dense chromium oxide brick for E glass and C glass cell kiln wall, card or other parts of the erosion of serious, life expectancy of up to 6 to 7 years. In recent years, chromium products have made new progress, such as the addition of Cr2O3 in AZS brick to form Al2O3-ZrO2-SiO2-Cr2O3 refractory, at high temperatures, Cr2O3 on the one hand and Al2O3 to form a solid melt, on the other hand because Cr2O3 is The high melting point material, which enters the glass phase of the brick, increases the viscosity of the glass phase, thereby increasing the exudation temperature of the glass phase and greatly increasing the glass resistance to glass. A US company produces a re-bonding AZS / Cr2O3 refractory, its chemical composition and physical properties is excellent, compared with the original Al2O3 / Cr2O3 material, the annual furnace to reduce power consumption 4%, yield increased by 15% The cost is reduced by 3.75%, the glass quality is not affected, the kind of brick can be press molding, hand pound molding or isostatic pressing, and then high temperature sintering. 

3. Basic bricks
The high purity directly combusted alkaline brick at 1800 ℃ is widely used in regenerative walls and arch. Germany has introduced a new material named RUBINAI · EZ with its chemical composition of MgO 75%, ZrO213.5%, SiO29 .5%, it is zirconite with the combination of magnesite bricks, in the early sintering, brick structure of zirconium silicate and magnesium oxide, along the granite around the formation of a layer of forsterite and zirconia protective layer, This structure greatly improves the brick anti-alkali and anti-sulfate erosion performance, do the middle of the thermal storage room lattice brick effect is good. 

4. Olivine magnets
The olivine-binding phase has a particularly strong resistance to erosion, and the corrosion resistance of the magnesium brick can be improved by increasing the forsterite content in the magnesium briquette phase. To this end, 20% of the perovaleite fines were added to the ingredients of the magnesium bricks to form a mortar-binding matrix that protects the magnesite particles and reduces the erosion. The brick price is relatively cheap, foreign has been used for a large number of glass kiln regenerator lattice in the middle. 

5. Barium fossil olivine brick
In view of the good erosion resistance of olivine and the lack of thermal shock resistance, the introduction of barium feldspar in its combined phase can obviously improve the thermal shock resistance of the brick. The barium feldspar is formed during the firing process and is present only in the bound matrix phase. When the content of barium feldspar is 15%, the best performance of silicon is about 1250 ℃. Studies have shown that barium feldspar can resist alkali and sulphate erosion. 

6. Unshaped refractories
Unstable refractory in the application of glass kiln is also a development trend. British use of refractory concrete prefabricated block masonry thermal storage room, lattice brick bottom arch, flue, small furnace pallets, burners, etc., greatly reducing the kiln structure of the joints, improve the furnace speed and shorten the cold repair time , France Xipu ERSOL ER1681 is based on ER1681 fused particles as the main component of the amorphous refractory series, and the use of electric frit with the bottom of the pool, its excellent anti-glass erosion, and the tendency to precipitate bubbles and the formation of stones Weak. Some of Japan's glass kiln bottom has all used ER2SOL series of unshaped materials. The theoretical research on refractory materials for foreign glass kilns revolves around how to further improve the anti-glass erosion and improve the mechanical properties in order to further extend the life of the kiln. 

7. Insulation material for glass kiln
Foreign glass kiln insulation widely used high alumina brick, lightweight silicon brick and fiber, mainly based on aluminosilicate fiber-based materials. In Germany, in addition to the use of diatomaceous earth, aluminosilicate and silicate fiber materials, widely used calcium silicate-based light products, in addition to Didier and the glass industry in close cooperation with the development of a composite board, It is made up of two materials, called "SSH" (Shood Supral H). The first layer in the composite panel has a thickness of 50 to 75 mm and is made of a relatively dense clay refractory. The thickness of the second layer is 100 to 125 mm. It is made of ultra-lightweight refractory (refractory clay or calcium silicate Material) made. The total thickness of the composite board is 150 to 200 mm, and the size of the composite board is the same as the size of the brick surface to be insulated. 

The CIS uses light phosphate concrete, fiber products and fillers. The binding agent for the light refractory granule filler is an aluminophosphate binder, the acid ratio of the binder is 2.3, the density is between 1.55 and 1.6 g / cm3, the particles are industrial Al2O3, artificial Al2O3, and the working temperature is 1800 ℃. Lightweight phosphate concrete is a kind of new type of lightweight heat-resistant concrete made of phosphate as binder and porous clay. The main performance parameters of light phosphate concrete are: density 800 ~ 1100kg / m3 , The compressive strength range is 7 ~ 12MPa, the thermal conductivity is 0.3 ~ 0.35W / cm · k, the long-term use temperature is 1270 ℃.

Fused Cast AZS Block - The best Fused Cast AZS Block from China Zhengzhou Shi Xing Refractory.

AZS fused cast block is also called fused cast block which is abbreviated as AZS because it contains Al2O3－ZrO2－SiO2. Fused cast AZS block is made from pure alumina powder and Zircon sand (composed of 65% zirconia and 34% SiO2). After Alumina powder and zircon sand melting in electric furnace, they are cast into various molds and cool themselves down to become white solid. Because of the different content of Zirconia from 33%-41%, Jiulong Brand fused cast AZS blocks can be divided into three types AZS—33#, AZS—36# and AZS—41#. 



Physical and Chemical Specifications (JL-AZS33)
JL-AZS33 Description:
Fused cast AZS 33# block has dense micro structure which ensures its great resistance in glass liquid, thus you don’t have to worry about the solidification and other problems. It is widely applied to glass furnace for superstructure, working pool side wall, paving blocks, feeder channels, tank bottoms, C-shaped block and doghouse crown, etc.



Advantages:
1. Compact microstructure
2. Good erosion resistibility to molten glass
3. Good thermal shock resistibility, high compression resistance
4. Barely rendering blister
5. A variety of formats and shapes for furnace different working areas
Different casting methods can be adopted to produce various shapes and sizes for different areas of glass furnaces.Fused Cast AZS Block

Physical and Chemical Specifications (JL-AZS36)
Description:


Physical and Chemical Specifications (JL-AZS41)
Description: